Bathroom Renovation Plumbing Costs in Melbourne: A Real-World Price Breakdown

A bathroom renovation in Melbourne can be a $15,000 project or a $60,000 project, and the plumbing share of that varies just as widely. This is a real-world breakdown of what licenced plumbers charge in 2026 across Melbourne’s east, what drives the price up, and where homeowners get caught out.

What plumbing work does a bathroom reno include?

A full bathroom renovation typically involves: rough-in (relocating or replacing supply and waste pipes), waterproofing inspection points, fixture supply (or installation of customer-supplied fixtures), commissioning and pressure-testing, and the Certificate of Compliance.

For a like-for-like refresh where fixtures stay in their existing positions, plumbing is straightforward. For a layout change (moving the toilet to a different wall, swapping a tub for a shower), the cost can triple because pipework gets opened up, rerouted and reinspected.

Typical plumbing cost ranges for a Melbourne bathroom reno

These are 2026 Melbourne east figures for a single bathroom:

Like-for-like refresh (no layout change): $2,500 to $5,500. Includes removing and reinstalling fixtures, replacing the basin mixer, shower mixer, toilet inlet, and trap, plus testing and certification.

Mid-scope renovation (one or two fixtures relocated): $5,500 to $11,000. Adds wall-chasing, new pipework, and waterproofing coordination.

Full layout change (toilet wall moved, shower replaced with bath, new vanity wall): $11,000 to $20,000. Adds floor cuts, joist work, and significant rough-in.

These numbers exclude the cost of fixtures themselves. A mid-range tap set, basin mixer, shower mixer, toilet suite and bath might add $3,000 to $8,000 in fixtures alone.

What drives the cost up?

Access: a second-storey bathroom in a brick veneer costs more than a ground-floor concrete slab because pipe runs are harder.

Age of the home: 1960s and 1970s Melbourne homes often have galvanised steel water supply that needs replacing. Every metre adds cost.

Clay sewer pipes: pre-1980s homes have vitrified clay sewer pipes that may need replacing if the renovation reveals existing damage.

Waterproofing requirements: the National Construction Code requires waterproofing to specific membrane standards. The plumber works around this, not on it, but timing matters and bad coordination causes rework.

Compliance certification: every plumbing job that touches water service points needs a Certificate of Compliance. This is included in plumber pricing but is non-negotiable. See vba.vic.gov.au for the regulatory framework.

How to keep plumbing costs down

Keep the layout. Every fixture relocation adds at least $1,200 to the plumbing bill. If the existing toilet, basin and shower positions work, leave them.

Buy your own fixtures from a reputable supplier (Reece, Tradelink, Beaumont Tiles, or direct from brand showrooms). Plumbers often charge a small handling fee on customer-supplied fixtures but you save the markup, typically 10 to 30 percent.

Check pipes before you tile. A camera inspection of the existing waste pipes before tiling costs around $400 and can save thousands if hidden issues are found early.

Use one plumber for the whole job. Bringing in a separate plumber at commissioning often means rework because the rough-in plumber’s choices don’t match.

Get a fixed-price quote with inclusions clearly listed. Hourly billing on a large reno can run wild. A fixed quote forces clarity.

What about gas?

If your bathroom has gas-boosted hot water that needs replacing during the reno, expect $1,800 to $3,500 for the unit and installation, depending on whether you upgrade to continuous flow or heat pump. The gas work requires a Type A Gas Compliance certificate from Energy Safe Victoria. See esv.vic.gov.au.

FAQ

How long does the plumbing part of a bathroom reno take?

Rough-in is usually 2 to 4 days. Commissioning after tiling is 1 to 2 days. Plumbing is not the bottleneck on most renos - waterproofing curing and tiling take longer.

Do I need permits?

For a single bathroom in a residential property, generally no building permit is needed if the structure isn’t altered. Plumbing always requires a Certificate of Compliance from a licenced plumber.

Why is my quote so much higher than my neighbour’s?

Layout changes, access difficulty, and age of pipework. Two identical-looking bathrooms can have completely different plumbing costs once the walls come down.

Can I do any of the plumbing myself?

No. The Plumbing Regulations 2018 restrict almost all bathroom plumbing to licenced plumbers. See consumer.vic.gov.au for what is and is not permitted.

What happens if I find lead pipes during the renovation?

Lead supply pipes need replacing as part of the reno. This typically adds $1,500 to $3,500. The National Health and Medical Research Council (nhmrc.gov.au) has guidance on lead in drinking water.

Get a transparent quote

Newton Plumbing quotes bathroom renovations as fixed-price packages with every inclusion listed: rough-in, fixtures, commissioning, certificates, and any contingencies for older pipework. We work with tilers, electricians and builders across Melbourne’s east, including Box Hill, Glen Waverley and Vermont.

Phone Newton Plumbing - +61 414 951 362. Licence #107733. Newton Huang Licenced Plumber.

Related reading:

• Toilet Buying Guide: Caroma, Roca, Fienza

• • Tapware in Wet Areas: Chrome, Brushed Nickel or Matte Black

  • • Hot Water Unit Leaking: What to Check First

    • • What Is a Certificate of Compliance

    • External references:

    • • vba.vic.gov.au - Plumbing Regulations 2018

      • • esv.vic.gov.au - Energy Safe Victoria for gas work

        • • consumer.vic.gov.au - DIY plumbing limits

          • • nhmrc.gov.au - lead in drinking water guidance